How much is a new boiler in the UK?
The cost of a new boiler in the United Kingdom depends on the type of boiler, the complexity of the installation, your property and heating system, and whether any upgrades are needed (controls, radiators, pipework, flue changes, condensate routing and more). Below you’ll find a clear breakdown of what influences price, what’s typically included, and how to get accurate quotes for your home.
Tip: Boiler prices vary significantly by home layout and installer access. For an accurate figure, request a written quote after a short survey (virtual or in-person).
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What affects the cost of a new boiler?
Two homes can need the same “type” of boiler but have very different installation costs. Installers typically price a boiler job based on the boiler itself plus the time, materials, and compliance work required to fit it safely and legally.
1) Boiler type & hot water setup
- Combi boiler: heats water on demand and usually removes the need for a hot water cylinder.
- System boiler: works with a hot water cylinder; often suited to homes with higher hot water demand.
- Regular (heat-only) boiler: typically used with a hot water cylinder and a cold water tank, often found in older systems.
If you’re changing boiler type (for example, moving from a regular boiler to a combi), expect additional work and costs for system alterations.
2) Installation complexity
- Like-for-like swap is usually the simplest.
- Boiler relocation (moving it to another wall, floor, loft, or cupboard) adds labour and materials.
- Flue changes can increase cost depending on route and access.
- Condensate pipe routing may need alteration to meet best practice and reduce freezing risk.
3) Boiler size and output requirements
Boilers are sized to match your home’s heating demand and hot water needs. Oversizing can waste energy, while undersizing can reduce comfort. An installer will consider factors like:
- Number of radiators / rooms
- Bathrooms and simultaneous hot water use
- Insulation levels and property layout
4) Upgrades and remedial work
Some quotes include additional improvements that help performance and reliability, such as:
- System flushing/cleaning and adding inhibitor
- Magnetic filter (where recommended)
- Thermostat and heating controls upgrade
- Radiator valve replacement or balancing
- Gas pipe upgrades if required for safe operation
What’s usually included in a boiler installation quote?
In the UK, a proper boiler replacement quote should clearly list what you’re paying for. While every job is different, most quotes will cover:
- Boiler supply and standard fittings (subject to specification)
- Labour to remove the old boiler and install the new one
- Commissioning (testing and setting up the boiler)
- Basic materials (pipework adjustments, valves, fittings) depending on the scope
- Safety checks and required documentation
- Waste removal (often included, but confirm)
Always ask for clarity on what is excluded. Common exclusions can include redecoration, carpentry alterations, extensive pipe rerouting, or upgrading radiators throughout the home.
Common boiler replacement scenarios (and how they change cost)
This is often the most straightforward route: replacing your current boiler with a similar type in the same location. It can reduce labour time and minimise alterations to pipework, flue, and controls (though upgrading controls is often worthwhile).
Changing to a different boiler type can involve removing or bypassing tanks/cylinders, altering pipework, and adjusting controls. It can be a great fit for some homes, but it’s typically more involved than a like-for-like swap.
Relocation may require new flue routing, condensate pipe changes, additional pipework, and potentially more making-good. Access (tight cupboards, lofts, multi-storey routes) can significantly affect labour time.
How to compare boiler quotes (and avoid surprises)
Price matters, but the cheapest quote can become expensive if key items are missing. When comparing quotes, check:
- Scope of work: Is it a like-for-like swap, conversion, or relocation?
- System cleaning: Is a flush included, and what method will be used?
- Controls: Are thermostat/programmer upgrades included and explained?
- Filter/inhibitor: Are these included where recommended?
- Materials: Does it include required pipework changes, valves, and fittings?
- Timescale: How many days, and will you be without heating/hot water?
- Warranty: What’s included and what you must do to maintain it (e.g., servicing)?
Ask for a fixed written quote
To make quotes comparable, ask each installer to confirm the work in writing, including what is included/excluded and any assumptions (access, condition of existing pipework, whether upgrades are required after inspection).
New boiler cost vs running costs: what to consider
The upfront price is only part of the decision. A suitable, well-installed boiler with effective controls can help improve comfort and potentially reduce wasted energy. To get the best result:
- Choose the right size for your home and hot water use.
- Improve heating controls so the system only heats when needed.
- Address system health (sludge, poor circulation, unbalanced radiators).
- Consider insulation improvements to reduce heat loss.
Energy prices and usage vary by household and region. For exact running cost impacts, an installer can advise based on your current setup and heat demand.
Do you need a new boiler? Common signs
- Frequent breakdowns or recurring fault codes
- Uneven heating or radiators slow to warm up
- Hot water performance has dropped
- Strange noises (banging, kettling, whistling)
- Rising repair costs and repeated call-outs
- Parts are difficult to source
- Boiler is no longer suitable for your household
- System upgrades planned (e.g., renovations)
If your boiler has a minor issue, a repair may be more cost-effective. If faults are recurring or the system is struggling to meet demand, replacement may make more sense.
Frequently asked questions
It depends on the job scope. A straightforward replacement may be completed more quickly than a conversion or relocation that needs extra pipework, flue changes, or controls upgrades. Your installer should provide a clear timescale in the quote.
It can be, depending on your hot water usage, water pressure, number of bathrooms, and available space. Conversions can involve more work than a like-for-like swap, so compare quotes and ask an installer to assess suitability for your home.
- What exactly is included in the quote (materials, flushing, controls, disposal)?
- Will the boiler be sized based on my home and hot water needs?
- Will there be any downtime for heating and hot water?
- What aftercare is offered, and what servicing is required?
Get boiler quotes for your home
Because boiler installation costs are highly dependent on your property and existing system, the most reliable way to find out how much a new boiler will cost for you is to get a few fixed quotes and compare like-for-like.
Request quotes
Share a few details and we’ll help route your request to suitable local installers.
To get an accurate quote, have ready:
- Boiler location (kitchen, cupboard, loft, etc.)
- Boiler type (if known)
- Number of radiators
- Number of bathrooms
- Any issues with water pressure or heating